效果

BurnToFadeOut.shader代码

Shader "BurnToFadeOut" {

Properties {

_StartColor ("Start Color", Color) = (1,1,1,1)

_EndColor ("End Color", Color) = (1,1,1,1)

_MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}

_Cutoff ("Alpha cutoff", Range(0,1)) = 0.5

_Emit ("Emit level", Range(1,100)) = 0

_Range ("Range", Range(0,1)) = 0

}

SubShader {

Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}

LOD 100

Lighting Off

Pass {

CGPROGRAM

#pragma vertex vert

#pragma fragment frag

#include "UnityCG.cginc"

struct appdata_t {

float4 vertex : POSITION;

float2 texcoord : TEXCOORD0;

};

struct v2f {

float4 vertex : SV_POSITION;

half2 texcoord : TEXCOORD0;

};

sampler2D _MainTex;

float4 _MainTex_ST;

fixed4 _StartColor;

fixed4 _EndColor;

fixed _Cutoff;

half _Emit;

half _Range;

v2f vert (appdata_t v)

{

v2f o;

o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);

o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);

return o;

}

fixed4 frag (v2f i) : COLOR

{

fixed4 col = tex2D(_MainTex, i.texcoord);

fixed a = dot(col.xyz, fixed3(0.3, 0.59, 0.11));

col.a = a;

clip(a - _Cutoff);

if(a < _Cutoff + _Range)

col.xyz = lerp(_StartColor.xyz, _EndColor.xyz, (saturate(a - _Cutoff) / _Range)) * _Emit;

return col;

}

ENDCG

}

}

SubShader {

Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}

LOD 100

Pass {

Lighting Off

Alphatest Greater [_Cutoff]

SetTexture [_MainTex] { combine texture }

}

}

}

光晕效果需要把摄像机HDR打开并挂上这个脚本(Pro版导入Standard Asset里的)

//Bloom.js

#pragma strict

@script ExecuteInEditMode

@script RequireComponent (Camera)

@script AddComponentMenu ("Image Effects/Bloom and Glow/Bloom (Optimized)")

class FastBloom extends PostEffectsBase {

public enum Resolution {

Low = 0,

High = 1,

}

public enum BlurType {

Standard = 0,

Sgx = 1,

}

@Range(0.0f, 1.5f)

public var threshhold : float = 0.25f;

@Range(0.0f, 2.5f)

public var intensity : float = 0.75f;

@Range(0.25f, 5.5f)

public var blurSize : float = 1.0f;

var resolution : Resolution = Resolution.Low;

@Range(1, 4)

public var blurIterations : int = 1;

public var blurType = BlurType.Standard;

public var fastBloomShader : Shader;

private var fastBloomMaterial : Material = null;

function CheckResources () : boolean {

CheckSupport (false);

fastBloomMaterial = CheckShaderAndCreateMaterial (fastBloomShader, fastBloomMaterial);

if(!isSupported)

ReportAutoDisable ();

return isSupported;

}

function OnDisable() {

if(fastBloomMaterial)

DestroyImmediate (fastBloomMaterial);

}

function OnRenderImage (source : RenderTexture, destination : RenderTexture) {

if(CheckResources() == false) {

Graphics.Blit (source, destination);

return;

}

var divider : int = resolution == Resolution.Low ? 4 : 2;

var widthMod : float = resolution == Resolution.Low ? 0.5f : 1.0f;

fastBloomMaterial.SetVector ("_Parameter", Vector4 (blurSize * widthMod, 0.0f, threshhold, intensity));

source.filterMode = FilterMode.Bilinear;

var rtW = source.width/divider;

var rtH = source.height/divider;

// downsample

var rt : RenderTexture = RenderTexture.GetTemporary (rtW, rtH, 0, source.format);

rt.filterMode = FilterMode.Bilinear;

Graphics.Blit (source, rt, fastBloomMaterial, 1);

var passOffs = blurType == BlurType.Standard ? 0 : 2;

for(var i : int = 0; i < blurIterations; i++) {

fastBloomMaterial.SetVector ("_Parameter", Vector4 (blurSize * widthMod + (i*1.0f), 0.0f, threshhold, intensity));

// vertical blur

var rt2 : RenderTexture = RenderTexture.GetTemporary (rtW, rtH, 0, source.format);

rt2.filterMode = FilterMode.Bilinear;

Graphics.Blit (rt, rt2, fastBloomMaterial, 2 + passOffs);

RenderTexture.ReleaseTemporary (rt);

rt = rt2;

// horizontal blur

rt2 = RenderTexture.GetTemporary (rtW, rtH, 0, source.format);

rt2.filterMode = FilterMode.Bilinear;

Graphics.Blit (rt, rt2, fastBloomMaterial, 3 + passOffs);

RenderTexture.ReleaseTemporary (rt);

rt = rt2;

}

fastBloomMaterial.SetTexture ("_Bloom", rt);

Graphics.Blit (source, destination, fastBloomMaterial, 0);

RenderTexture.ReleaseTemporary (rt);

}

}

原文：http://www.cnblogs.com/mrblue/p/5190536.html